MAX1925

PRODUCTION

Switch-Mode 1-Cell Li+ Chargers Smallest, Simplest Switch-Mode Li+ Charger in 4mm x 4mm QFN Package

Analog Devices MAX1925 Product Info

10 February 2026 6

Features

Small (4mm x 4mm) Package

4.25V to 12V Input Range (MAX1926)

Overvoltage Lockout at 6.1V (MAX1925)

±0.75% Battery Regulation Voltage

Set Charge Current with One Resistor

Automatic Input Power Sense

LED (or Logic-Out) Charge Status and Fault Indicator

Programmable Safety Timer

Autorestart at Cell = 4V

Thermistor Monitor Input

Part details & applications

The MAX1925/MAX1926 single-cell lithium-ion (Li+) switch-mode battery chargers use an external PMOS pass element step-down configuration. Charge current is programmable, and an external capacitor sets the maximum charge time.

Additional features include automatic input power detection (active-low ACON output), logic-controlled enable, and temperature monitoring with an external thermistor. The MAX1925 disables charging for inputs greater than 6.1V, while the MAX1926 charges for inputs between 4.25V and 12V.

The MAX1925/MAX1926 feature two precondition levels to restore near-dead cells. The devices source 4mA to a cell that is below 2V while sourcing C/10 to a cell between 2V and 3V. Full charge current is then applied above 3V. A active-low CHG output drives an LED to indicate charging (LED on) and fault conditions (LED blinking).

The MAX1925/MAX1926 are available in a 12-pin 4mm x 4mm thin QFN package and are specified over the extended temperature range (-40°C to +85°C). An evaluation kit is available to speed design.

Applications

Cradle Chargers
Digital Still Cameras
PDAs
Self-Charging Battery Packs

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